Built-in small animal mandible extender

Abstract

The utility model relates to a built-in small animal mandible extender which comprises a traction frame, a guide groove is formed in the traction frame in the length direction, the lower end face of the traction frame is in a cylindrical arc shape, the upper end of the traction frame is a hollow cylindrical section, a guide groove is formed in the traction frame in the length direction of a cylinder, the edge of the traction frame is flat, and the traction frame can be conveniently attached to the mandible face. The fixed traction plate and the traction seat are fixed at the head part of the traction frame, and the screw rod penetrates through the traction frame; the movable traction seat is provided with a threaded through hole and is restrained in the guide groove; and when the screw rod is screwed, the movable traction seat can axially slide in the guide groove. The rear end of the screw is connected with an expansion base with the cross section equivalent to that of the cylinder and then connected with an adjusting handle, and the tail end of the adjusting handle is in a linear groove shape with the two ends communicated. The device is small, exquisite, simple, capable of achieving direct 3D printing, easy to assemble, easy to use, accurate in adjustment and suitable for the distraction osteogenesis operation of the mandible of the small animal.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the medical instrument of animal oral cavity, jaw face experiment, especially is applied to the mandibular distraction osteogenesis experiment of small animals (rat, rabbit etc. BACKGROUND

[0002] At present, there are various extenders specially used for human jaw bone, which are widely used in oral cavity and jaw face surgery. The principle of mandibular extender is roughly summarized as follows: the soft tissue and periosteum on the surface of mandibula are separated, and the osteotomy line is designed along the ascending ramus of mandibula or other positions. After the mandibula is completely or incompletely cut along the osteotomy line, the extender is installed, and the slow traction is started. The osteogenesis potential induced by the traction of the bone is utilized to gradually extend the mandibula, so as to achieve the purpose of treating mandibular deformity diseases characterized by bone mass loss caused by congenital or acquired factors.

[0003] For example, the Chinese utility model patent "Jaw bone traction extender" with the patent number ZL95200175.6 (publication number CN2205709Y), the Chinese utility model patent "Jaw bone extender" with the patent number ZL98225259.5 (publication number CN2341572Y), and the Chinese utility model patent "Intraoral mandibular traction extender" with the patent number ZL99234512.X (publication number CN2378010Y) all disclose jaw bone extenders with the same working principle. They all use a screw rod (1) as the traction transmission component. During operation, the rotating adjustment handle (7) drives the screw rod (1) to rotate, and then drives the movable traction plate to move.

[0004] The existing jaw bone extenders are mostly suitable for humans, but for animal experiments, they all have the weaknesses of bulky size, overly complex device, difficulty in mass production, modification and assembly, etc. Moreover, for small animals (rats, rabbits and other rodents), the universal joint adjustment handle (7) designed for aesthetic appearance is unnecessary, because the mandibula of small animals (rats, rabbits and other rodents) is small, and the traction frame (4) should be small and delicate. In addition, the precision requirement for extending the mandibula of small animals (rats, rabbits and other rodents) is higher than that of humans, and the flexible adjustment handle will increase the adjustment error, and the assembly requirement of the miniature universal joint is high. Therefore, the original utility model discards the original universal joint, reduces the production cost and assembly difficulty. Moreover, the end of the original patent adjustment handle is hexagonal, and a screwdriver with corresponding size must be matched for adjustment, which is inconvenient to operate, and it is not easy to observe the rotation angle without a special screwdriver. The end of the adjustment handle of the utility model is grooved, which can be clamped into any hard sheet tool including a straight screwdriver, and the rotation angle can be clearly observed outside the body. CONTENT OF THE UTILITY MODEL

[0005] The utility model discloses a built-in small animal mandible lengthener, which comprises a traction frame, a guide groove is arranged on the traction frame along the length direction, the lower end surface of the traction frame is in a cylindrical arc shape, the upper end is a hollow cylindrical section, a guide groove along the length direction of the cylinder is arranged in the hollow cylindrical section, the edge is smooth, and the traction frame is conveniently attached to the mandible surface, the traction frame is free of a bottom surface on the upper and lower sides, a screw rod penetrates the traction frame, the top of the screw rod protrudes from the traction frame and is clamped at the top of the traction frame by a clamp, and the bottom is connected to an adjusting handle.

[0006] The clamp has a cross section equivalent to the cross section of the cylindrical body of the traction frame, is clamped at the non-threaded part of the screw rod protruding from the top end of the traction frame, can be pressed and clamped tightly, and thus the screw rod cannot be separated from the traction frame by being screwed.

[0007] The fixed traction plate and the first traction seat are integrated, an axial threaded through hole is arranged on the fixed traction plate, the screw rod penetrates the axial threaded through hole, the outer diameter of the traction seat can be adapted to the inner diameter of the hollow cylinder of the traction frame, the fixed traction plate and the traction seat are fixed to the traction frame, and two mounting holes for self-tapping screws are arranged on the two sides of the fixed traction plate.

[0008] The movable traction plate and the second traction seat are integrated, the outer diameter of the traction seat can be adapted to the inner diameter of the hollow cylinder of the traction frame, an axial threaded through hole is arranged on the traction seat, the screw rod penetrates the axial threaded through hole, and when the screw rod is screwed, the movable traction seat can slide axially in the guide groove.

[0009] The integrated screw rod adjusting handle: the screw rod and the adjusting handle are one part, are arranged in the guide groove and can rotate around the axis of the screw rod, the screw rod is located in the guide groove and the surface of the screw rod does not protrude from the cylindrical section of the upper end of the traction frame, the screw rod is provided with threads except the part in contact with the clamp, the top end of the screw rod protrudes from the clamp groove and is clamped by the clamp at the non-threaded part of the screw rod, the rear end of the screw rod is connected to the base with a diameter equivalent to the cross section of the cylindrical body and is connected to the adjusting handle, and the end of the adjusting handle is in the shape of a groove with two ends connected.

[0010] As a preferred embodiment, the end of the adjusting handle is in the shape of a groove, can clamp a straight screwdriver with a diameter of 1 cm, the traction seat and the traction plate are designed to be integrated, convenient for processing and assembly, the clamp at the tail end of the guide groove is slightly larger than the opening diameter of the guide groove, the tightness of the clamp can be freely adjusted, the screw rod is provided with no threads at the part assembled with the clamp, and the clamp is not easy to slide up and down along the screw rod.

[0011] Compared with the prior art, the utility model discloses the advantages of: few assembly parts, using the article such as card, integrated traction seat traction board, compared with the current extender, easy to assemble, low in cost, few parts also reduce the system error, almost can not use the bonding technical means such as electric welding, glue, cancel the universal joint, the former extender is screwed when requiring the handle outside the body to adjust must be in a straight line with the screw rod in the body, it is difficult to grasp in actual operation, the error is big, directly connect the screw rod with the adjusting handle, reduce the adjusting error, guarantee the demand of small animals (rat, rabbit and other rodents) to the adjusting accuracy, maximum limit simplification mounting hole, for the human mandible, more mounting holes can improve stability indeed, but the mandible of small animals (rat, rabbit and other rodents) is small, need guarantee that the extender keeps the mechanical stability during the extension fixed period can reduce the degree of the extender covering the mandible as far as possible, avoid that the periosteum is too little and influences the tensile osteogenesis experiment effect, the utility model simplifies to the installation hole of one, guarantee the mechanical stability and save the space greatly, and the stability and good osteogenesis are proved through the experiment. The adjusting handle is reformed, the adjusting handle of the former extender mostly presents hexagon, needs to use the adapted screwdriver to twist the extender, and the degree of twisting is not easy to observe, if the screwdriver is not adapted, then the slippage is easy to appear, and too much or too little is twisted, and the utility model is changed into the groove of the one word type two sides, and the screwdriver of diameter cm or any similar thickness hard object even human nail can be twisted, and the screw rod in the body is twisted in the one word type groove, and the angle of the screw rod in the body is visualized in the outside, convenient operation. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 The utility model provides structural schematic diagram for providing the utility model.

[0013] Figure 2 The utility model provides the front view structural schematic diagram for providing the utility model.

[0014] Figure 3 The utility model provides the three-dimensional half cut structural schematic diagram for providing the utility model.

[0015] Figure 4 The utility model provides the plan view structural schematic diagram for providing the utility model.

[0016] Figure 5 The utility model provides the bottom view structural schematic diagram for providing the utility model. DETAILED DESCRIPTION

[0017] The utility model is further described in further detail below in conjunction with the drawings.

[0018] As Figures 1-5 The first embodiment of the utility model is shown.

[0019] The built-in animal mandible lengthener comprises a traction frame 4, the lower end surface of which is in cylindrical arc shape, the upper end is in hollow cylindrical section, and a guide slot is opened in the length direction of the cylinder, the edge is smooth, which is convenient to adhere to the mandible surface, a screw rod 1 is located in the guide slot, and the surface is not protruded on the upper end cylindrical section of the traction frame 4.

[0020] The traction frame 4 is without bottom surface upward and downward, the screw rod 1 penetrates through the same, the top is stretched out of the traction frame 4 and is clamped to the top of the traction frame 4 by a clamp, and the bottom is connected with an adjusting handle 7.

[0021] The clamp is in cross section corresponding to the cross section of the cylindrical body of the traction frame 4, is clamped to the non-threaded position of the screw rod 1 stretched out of the top end of the traction frame 4, can be pressed and clamped, so that the screw rod 1 cannot be separated from the traction frame 4 along with the screwing;

[0022] The fixed traction plate and the first traction seat 3 are integrated, an axial threaded through hole is opened in the same, so that the screw rod 1 penetrates through, the outer diameter of the traction seat can be adapted to the inner diameter of the hollow cylinder of the traction frame 4, the traction plate and the traction seat are fixed on the traction frame 4, and two mounting holes for self-tapping screws are respectively arranged on the two sides of the fixed traction plate;

[0023] The movable traction plate and the second traction seat 5 are integrated, the outer diameter of the traction seat can be adapted to the inner diameter of the hollow cylinder of the traction frame 4, an axial threaded through hole is opened in the same for the screw rod 1 to penetrate through, and when the screw rod 1 is screwed, the movable traction seat can axially slide in the guide slot;

[0024] The integrated screw rod 1 adjusting handle 7: the screw rod 1 and the adjusting handle 7 are one part, are located in the guide slot and can rotate around the axis line, the screw rod 1 is without thread at the position in contact with the clamp, the rest is thread adapted to the traction seat, the top end of the screw rod 1 is stretched out of the clamp slot and is clamped to the non-threaded position of the screw rod 1 by the clamp. The rear end of the screw rod 1 is connected with the base 6 of the same cross section as the cylindrical body and is connected with the adjusting handle 7, and the end of the adjusting handle 7 is in the groove shape of the character type with both ends communicated.

[0025] In the embodiment, titanium alloy 3D printing is used

[0026] In use,

[0027] Installation: Choose the right jaw extender model, first install the extender, check if the extender is working properly, and screw the movable integrated traction seat traction plate to the top of the integrated fixed traction seat traction plate to determine the osteotomy line and the installation position of the extender, separate the surface skin and soft tissue, separate the periosteum with a separator, place the extender in the predetermined position, compare the size and installation hole position, and mark the installation hole and osteotomy line. Saw the mandible along the osteotomy line, pay attention to not completely saw off, and keep the jawbone at both ends of the osteotomy line intact to help installation. Then place the extender at the planned position, pay attention to the straight line seam between the fixed traction seat and the movable traction seat, which needs to be strictly aligned with the osteotomy line, then drill a hole at the installation hole according to the marked position, and tighten it with a self-tapping screw. Finally, use an ultrasonic bone knife or a saw to saw off the bone at both ends of the osteotomy line, try to rotate the adjusting handle 7, and observe whether the extender can accurately pull apart the gap between the lower jawbone ends according to the rotation angle of the adjusting handle 7. When the movable traction seat is at the bottom end of the traction frame 4 and cannot be twisted any more, it is determined that there is no mechanical failure such as jamming, then adjust the movable traction seat to the original position at the top end of the traction frame 4, flush according to the surgical steps, sterilize, close and suture the wound, and leave the adjusting handle 7 outside the body.

[0028] Extension: After installation, rotate the adjusting handle 7 during the extension period according to the experimental design, one revolution of the screw rod 1 is 0.3mm, when twisting the adjusting handle 7, a suitable flathead screwdriver can be used, or a hard sheet object with a width can be inserted into the groove, and twisted to the required angle and extension angle according to the experimental requirements. According to the principle of distraction osteogenesis, when the jaw is pulled, osteogenesis occurs, and during the gradual separation of the fixed traction seat and the movable traction seat, the gap between the jaw ends is continuously enlarged, and new bone is continuously generated. Since the adjusting handle 7 of the utility model is a flathead, the rotation angle can be clearly observed outside the body, and the extension distance in the body can be calculated.

[0029] Removal: Separate the skin and soft tissue according to the original incision, and then remove the extender after unscrewing the self-tapping screw with a suitable screwdriver.

[0030] Although the preferred embodiments of the utility model have been described in detail above, it should be clearly understood that the utility model can have various modifications and changes for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. An internal mandibular lengthener for small animals, characterized in that: The traction frame (4) has a guide slot along the length direction, the lower end of the traction frame (4) is a cylindrical arc, the upper end is a hollow cylindrical section, a guide slot along the length direction is formed in the hollow cylindrical section, the edge is smooth, the traction frame (4) has no bottom surface on the upper and lower sides, the screw rod (1) penetrates the traction frame (4), The top of the traction frame (4) is clamped by the clip, and the bottom is connected with the adjusting handle (7). The clip has a cross section corresponding to the cross section of the cylindrical body of the traction frame (4), and is clamped at the non-threaded part of the top end of the screw rod (1) extending out of the traction frame (4), so that the screw rod (1) cannot be separated from the traction frame (4) by rotating. The fixed traction plate and the first traction seat (3) are integrated, an axial threaded hole is formed in the fixed traction plate, the screw rod (1) penetrates the threaded hole, the outer diameter of the traction seat can be matched with the inner diameter of the hollow cylindrical section of the traction frame (4), the traction plate and the traction seat are fixed on the traction frame (4), and two mounting holes for self-tapping screws are formed in the two sides of the fixed traction plate. The movable traction plate and the second traction seat (5) are integrated, the outer diameter of the traction seat can be matched with the inner diameter of the hollow cylindrical section of the traction frame (4), an axial threaded hole is formed in the traction seat for the screw rod (1) to penetrate, and the movable traction seat can axially slide in the guide slot when the screw rod (1) is rotated. The integrated screw rod (1) adjusting handle (7) is one part, is arranged in the guide slot and can rotate around the axis, the screw rod (1) is located in the guide slot and the surface does not protrude from the upper end of the traction frame (4), the screw rod (1) is partly threaded except the part in contact with the clip, the rest is matched with the traction seat, the top end of the screw rod (1) extends out of the clip and is clamped by the clip, the rear end of the screw rod (1) is connected with the base (6) having a cross section corresponding to the cylindrical body, and the adjusting handle (7) is connected with the base (6).

2. The internal small animal mandibular lengthener according to claim 1, wherein The end of the adjusting handle (7) is a groove-shaped recess, and can clamp a flathead screwdriver.

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